It is spyware or adware, if your not running them you can get them here
Spybot Seazrch and Destroy freeware with constant updates. They guy does it for free but requests donations.
http://www.safer-networking.org/en/index.html
Adware also free
http://www.download.com/3000-2144-10...amp;tag=button
IF your already using these programs make sure you update to the newest detections.
Good luck and happy popup killing